Voith Turbo. Voith Buffer Roller Coupling

Transcription

1 Voith Turbo Voith Buffer Roller

2 Prevent overload damage and accommodates alignment The patented Voith Buffer Roller (BR) transmits torque, between connected drive shafts. O Outer plate C Buffer set E Inner hub I Inner plate Z Bolts and nuts R Outer ring F Rigid hub Overview of standard components Product description The coupling uses a ring of flexible buffers, which compensate for axial, radial and angular offsets within the limits given in the table of alignment values on page 2. The patented buffer elements in the Voith BR are elastomeric cylinders located in pockets formed between the inner hub and outer ring. The large- volume buffers ensure that severe vibration loads are dampened. Buffers of softer compounds reduce vibrational loading more effectively than harder compound buffers, while harder compound buffers have a greater torque load capability. The life of the buffers is determined by the accuracy of alignment as well as the workload. The coupling has ample operation life in ideal working conditions. Fatigue failures can be avoided by scheduling a buffer change after hours of operation or by adjusting this period according to the life of the initial buffer set. Typical Applications Centrifugal pumps. Fans and vane compressors. Hammer mills. Bucket elevators. Scraper conveyors. Belt conveyors. Power generators. Ball mills. Turbine drives. Fluid couplings. Crushers. Calendars and shaker screens. Reciprocating pumps. Piston compressors. Axial float applications. Cross travel & long crane drives. Steel mill roller tables. Heavy reverse drives. Limited float available. Key benefits Overload protection capacity. Shock and vibration absorbtion. Choice of buffer materials. Alignment compensation. Ease of buffer replacement. operation and overload protection For almost 100% of it s operational time, a Voith BR overload protection flexible coupling is in a loaded mode of operation. When loaded, the flexible buffers are subjected to radial compression as the torque increases. Overload protection is achieved by a buffer rolling action. Overload protection can be adjusted by using fewer buffers with a minimum of two. Divide the couplings nominal torque by the full quantity of buffers. Divide this value into the required torque to establish how many buffers should be used. Insert evenly spaced. Reduces shock and vibration The Voith BR has high torsional flexibility, significantly dampens shock loads and torsional vibrations, protecting connected equipment. The non-linear spring characteristic of the coupling and the buffer damping properties counteracts any magnification of vibrations. 1

3 No axial Forces Easy alignment No Load Full Load Tn The coupling in Fig1 is recommended for axial float as seen in the gap tolerance in the table of alignment values below. Fig1 Fig2 Fig3 Angular displacement (deg) Fig2 shows overload protection. Fig3 shows torsional angle. r Radial or Parallel a Angular or Variance g - Minus + Plus Gap or Axial Alignment compensation The radial, angular as well as axial alignment values may be exceeded. However compensation of serious alignment, in particular the radial alignment, can adversely affect the Table of alignment values bearing life of driver and driven machine as well as the buffer life. Regular alignment checking is, therefore, important. When aligning the coupling, ensure that the dimensions r,a,and g are considered. Correct aligning of the coupling will increase the service life of the buffers. If the alignment is beyond the limits, the effect will be seen on the buffers and a shorter operational life will be the result. BR 0 BR 11 BR 13 BR 1 BR 17 BR 206 BR 236 BR 276 BR 306 Radial (mm) Angular (mm) Gap (mm) Cg 0.18 ±0.12 3± ±0. ± ±0.17 ± ±0.20 ± ±0.23 ± ±0.26 ±2. 0. ±0.31 ± ±0.36 7± ±0.3 7±3. BR 336 BR 366 BR 06 BR 6 BR 06 BR 6 BR 636 BR 716 BR 826 Radial (mm) Angular (mm) Gap (mm) Cg 0.6 ±0.3 ± ±0.8 ± ±0.3 ±. 0.8 ±0.8 11±. 0.6 ± ± ±0.73 1± ±0.83 1± ±0.3 1± ±1.07 1±7. Buffer replacement Radial Axial s do not require any servicing during operation. We recommend that a new buffer set is fitted during any major overhauls of the drive system. The coupling inner hub has a fastened plate that can be removed for access to the buffers, for inspection or replacing in situ, where enough space is available. Coat the buffers with a suitable lubricant before assembly. French chalk or silicon Diagram left illustrates buffer replacement. oil for natural rubber and oil or grease for nitrile urethane and composite materials. Apply the tightening torques listed in table below when fastening this plate and the ring with connecting set screws. When assembling ring onto hubs, gently tighten the set screws in cross order until the spigot is fully located before progressively tightening to the required torque as listed below. Bolt Tightening s Bolt or nut size Applied in Nm M M M6 M8 M10 M12 M16 M20 M2 M27 M30 M

4 selection procedure Step 1. Calculate Nominal Tn using Absorbed power Pa(kW). When not available use motor power. The installed or motor power (kw) is preferred in cases where the coupling must hold the stall power. Nominal is: Table 1 - Buffer materials Tn = Pa (kw) x 0 Shaft speed (rpm) Step 2. Multiply the answer by the service factor (SF) from Table 3. required is: Tr = Tn x SF Note: Tr must be smaller than Tp (peak torque of coupling). Step 3. Using this answer check coupling torque (Tp) in Table 2 and select the correct buffer material from Table 1. Step. Check the maximum speed (rpm), inertia, mass, bore sizes, keys and taperbush torque capacity where applicable. Material Used Nitrile 80a Urethane 3a Urethane 60d Urethane 7d Composite 0d Colour Buffer part code Permissible temperature Continuous range Intermittent range Fatigue capacity Abrasion resistance Torsional rigidity Buffer availability Resistance to: Petrol Benzole Oil & grease Acids Alkalines Hot water Normal weather Tropical climates Black BR (size) C80nt -30 o to 80 o C -6 o to 120 o C Medium Yellow BR (size) C3uy -3 o to 80 o C -0 o to 100 o C High Satisfactory Blue BR (size) C60db -3 o to 80 o C -0 o to 100 o C Very high Satisfactory Green BR (size) C7dg -3 o to 80 o C -0 o to 100 o C Very high Satisfactory Tan BR (size) C0dt -3 o to 200 o C -0 o to 230 o C Extreme < 20% Table 2 - Buffer torque capacity Type & Nitrile 80a Shore Black Urethane 3a Shore Yellow Urethane 60d Shore Blue Urethane 7d Shore Green Composite 0d Shore Tan Speed Max (rpm) BR 0 BR 11 BR 13 BR 1 BR 17 BR 206 BR 236 BR 276 BR 306 BR 336 BR 366 BR 06 BR 6 BR 06 BR 6 BR 636 BR 716 BR Table 3 - Service factor (SF) Electric Motors Duty Type Driven Machine (Examples) + Turbines Internal Combustion Engines 1 Cylinder 2+3 Cylinder + Cylinder Light duty Medium duty Heavy duty Extra heavy duty Ultra heavy duty Centrifugal pumps, fans, belt conveyors Hammer mill, bucket elevator, scraper conveyors Crushers, calendar, shaker screens, compressors Reciprocating pumps, compressors (3 cyl. or less) Steel mill roller tables, heavy reversing drives >

5 Voith buffer roller overload protection flexible drive coupling Minimum distance for buffer removal Fc Minimum distance for buffer removal Mc Cx Fk Cx Xh* Mk Cr Cr Cz x q øca øeb max Fh Cs øfb max øfd øcm øca øeb max Mh *Xg ømb max ømd øcm E C R F E C R X M Assembly ERF - Standard coupling Assembly EXM - Spacer coupling dimensions Cm Ca Fc Mc *Xg *Xh F/Mk Cz x q /s E/ F/Mh Ed F/Md Cr Cx Eb Max F/Mb Max Mass (kg) Inertia (kgm 2 ) BR 0 BR 11 BR M6x16 M8x12 M8x BR 1 BR 17 BR M10x12 M10x16 M12x BR 236 BR 276 BR M12x16 M16x12 M16x BR 336 BR 366 BR M20x12 M20x16 M2x BR 6 BR 06 BR M2x16 M27x12 M27x BR 636 BR 716 BR M30x12 M30x16 M36x When special length spacers are required, the dimension Xh or Xg must be specified by the customer on order. When ordering please specify The spacer inertia and mass must be added to the given values in the table above on request. Notes: The spacer dimensions are only a suggestion as customer requirements can be suited at a low cost. # Refer to page 2 for gap variation. Named by:- Brand Type Assembly Voith BR 336 ERF b180 b160 C80nt st Standard Description Component material (st=steel) (al=aluminium) Buffer material (80nt - 80 shore A nitrile) Driver/Driven shaft size

6 Modular designs Examples below show the versatility of the modular system of the Voith BR. From the selection below, find the arrangement that suits you best. Consult our representatives to discuss other options. ERF Standard EDM Standard with brake disc EBM Standard with brake drum ERA Adaptor flange coupling EXM Spacer coupling EXE Double buffer coupling FNF Compact with hub ECK-P Fluid standard ECK-V Fluid inverted ECK-X Fluid spacer ECK-S Fluid inverted spacer ECK-Z Fluid flange ECK-N Fluid to standard flange ECK-F Fluid compact ECK-D Fluid compact with brake disc ECK-B Fluid compact with brake drum ECK-Y Fluid bearing supported ECK-W Fluid compact bearing supported

7 Voith buffer roller overload protection flexible coupling. Model ECK The coupling assembly with nitrile 80a (black) buffers are pre-selected to suit Voith and other similar fluiddrive couplings. Checks are therefore, only required when the other buffer materials are used. This coupling accommodates the axial growth due to heat expansion and allows the axial movement required. Assembly ECK-P Fluid standard Cx Cr Pc Kf Kw Assembly ECK-X Fluid spacer Cx Cr Kf Xc Sh Kw øca øeb øku økp økm øca øeb øku økp økm Assembly ECK-V Fluid inverted E C Kf Vc I Kw K Assembly ECK-S Fluid inverted spacer Kf E Sh Sc C K S Kw I Dimensions økm økp øko øku H7 øsi øca Kf Sh Cx Cr Kw Pc Vc Sc Xc øeb max Mass (kg) Inertia (kgm 2 ) Voith BR 11 BR 13 BR DT/T DT/T206 DT/T27 BR 17 BR 206 BR T366 T22 T87 BR 276 BR 306 BR T62 T60 T70 BR 366 BR 06 BR T866 T1000 T110 All dimensions in mm. Voith reserves the right to make design and dimensional changes without prior notice. In case a special length of spacer is required, the dimension Xc and Sc can be specified by the customer on order. Mass and inertia values do not include the spacer. Speed (rpm) up to 70 up to 1200 up to 1800 up to 3600 Admissable Radial Displacement Voith to to to mm 0.8mm 0.8mm 0.mm 0.6mm 0.6mm 0.3mm 0.mm - 0.2mm - - Type ECK-(all) Type ECK-(all) Admissable Angular Displacement Voith < ±0. ±0. ±0. Admissable Axial Displacement Voith to ±2. ±3. ±. ±. 6

8 Installation Installation is done to normal engineering practice, applicable to the type of application required. The BR design has large bore size capacities that allow for various types of taper bushes or locking elements to be fitted. The Voith QF bush has been used successfully in both keyed and keyless applications. Higher torque may require the use of Voith SLD units. Diameter (mm) > = 0 > = 60 > = 70 > = 0 > = 100 > = 12 > = 0 > = 10 > = 180 > = 200 > = 20 Fit (mm) > = > = 0.02 > = 0.0 > = 0.0 > = 0.0 > = 0.0 > = 0.08 > = 0.10 > = 0.2 > = 0.1 > = 0.1 Recommended bore sizes (BS:00); (DIN78) standard bore sizes available ex-stock. Recommended tolerances: Bore/Shaft ISO H7/m6. Shaft finish of 6.3 micron (µm) is recommended. Key ways according to (ISOR773); (BS23) and (DIN688). s with circumferential speeds over 36m/s should be balanced in two planes according to quality grade Q6.3 VDI Standard Certified dimensions are provided for Voith BR flexible overload protection coupling when required, or on order. Please request further details on our nonstandard coupling alternatives for specific applications such as limited end float or longer axial movement. Shaft (r/min) 0 to to to to to above Admissable Radial Displacement at Speed Voith Turbo (Pty) Ltd P O Box 13171, Witfield, 67, Gauteng, South Africa Tel: Fax: info@voith.co.za Range BR0-17 BR BR Type ERF Type ERF Admissable Axial Displacement Range BR0-17 BR BR ± 1 - ±1. ± 1. - ±2. ± 2. - ±3. Admissable Angular Displacement Range BR0-17 BR BR ± 0. ± 0. ± 0. Voith BR assembly ECK-P fluid standard coupling bolted at flange to Voith fluid coupling. Voith Turbo / (Buffer Roller PDF. 003/200) - Subject to change without notice as result of further technical development.